Barrel Man

Bird Stick

Chomp-Snake

Bothersome Wind

Caterdog
(combination of this and a dog)

Dangerous Bird Stick

Gooey Goo

Heavyhead

Huggy Bomb

Porkmind

Mr. Squeeks
(I'd like to try to get something Fonz/Fonzie-ish if possible)

Mummy Cat

Soaring Mouse

Restless Spirit

Rhino Rocket
(Rhinocerocket is good, but then what is the upgraded version called?)

Rhino Booster
(This is the upgraded version seen later in the game)

Road Block

Sara-Sara-Sahara
(Sara-sara describes something dusty/sandy/dry in Japanese)

Hothead

Red Lobster
(This guy is interesting when you're walking around outside. He tries to act tough,
but if you aren't intimidated right away, it sprouts legs and runs away fast, it's hilarious)